Rainbow Electronics MAX17031 - Manual (Page 12)

MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
12 ______________________________________________________________________________________
MAX17031
N H1 DH1
N L1 DL1
LDO5
V DD
SKIP
D1
D X1
BST1
OUT1
LX1
PGOOD
RTC
REF
GND
IN
C4
0.1 µF
C6
0.1 µF
C5
10nF
R4
1M Ω
R6
100k
Ω
C8
0.1 µF
C BST1
0.1 µF
C1
4.7 µF
C OUT1
C IN_PIN
0.1 µF
L1
5V OUTPUT
5V LDO OUTPUT
POWER GROUND
ANALOG GROUND
12V TO 15V
CHARGE PUMP
V CC
ILIM1
D
X2 C7
10nF
ON1
ON2
ONLDO
ILIM2
PAD
N H2 DH2
N L2 DL2 D2
BST2
OUT2
LX2
C BST2
0.1 µF
C OUT2
L2
3.3V OUTPUT
INPUT (V
IN
)*
7V TO 24V
COMBINED POWER-GOOD
RTC SUPPLY
R5
200k Ω
R1
47 Ω
C2
1.0 µF
R
ILIM1
R
ILIM2
C3
1
µF
C
IN
4x 10 µF
25V
ON OFF
*NOTE: LOWER INPUT VOLTAGES REQUIRE ADDITIONAL INPUT CAPACITANCE. IF OPERATING NEAR DROPOUT, COMPONENT SELECTION MUST BE
CAREFULLY DONE TO ENSURE PROPER OPERATION.
Figure 1. Standard Application Circuit—Main Supply